The Bristol Stool Scale (also called the Bristol Stool Chart) was developed at the University of Bristol in 1997 as a diagnostic tool for bowel function. It classifies human faeces into seven types based on shape and consistency, providing a standardised way to assess and communicate about bowel health.
For care homes, accurate bowel monitoring is essential. Constipation is extremely common in older adults and can lead to serious complications including faecal impaction, urinary retention, and delirium. The Bristol Scale provides objective measurement where subjective descriptions like "normal" or "loose" can mean different things to different people.
The Seven Types
Type 1 - Separate hard lumps
Like nuts, hard to pass. Indicates severe constipation. Stool has been in the colon for an extended period.
Type 2 - Lumpy and sausage-like
Sausage-shaped but lumpy. Indicates constipation. May be difficult or uncomfortable to pass.
Type 3 - Sausage with cracks
Like a sausage but with cracks on surface. Considered normal. Easy to pass.
Type 4 - Smooth and soft sausage
Like a sausage or snake, smooth and soft. Ideal stool type. Easy to pass, indicates healthy bowel function.
Type 5 - Soft blobs with clear edges
Soft blobs with clear-cut edges, passed easily. Considered normal, though lacking fibre.
Type 6 - Fluffy pieces with ragged edges
Fluffy pieces with ragged edges, mushy. Indicates mild diarrhoea. May indicate infection or medication side effect.
Type 7 - Watery, no solid pieces
Entirely liquid with no solid pieces. Indicates diarrhoea. Requires attention to prevent dehydration.
Key Point
Types 3 and 4 are considered ideal. Types 1-2 indicate constipation requiring attention. Types 6-7 indicate diarrhoea requiring attention. Type 5 is acceptable but may indicate dietary changes could help.
When to Escalate Concerns
Care staff should escalate to senior staff or healthcare professionals when:
Documentation Best Practices
Effective bowel documentation should include:
Common Mistakes to Avoid
- Using subjective terms: "Normal" means different things to different people. Use the Bristol number.
- Only recording bowel movements: Document when residents don't have a bowel movement too—"no bowel movement this shift" is useful information.
- Guessing: If you didn't observe it, record what the resident reports but note this.
- Ignoring patterns: Individual residents have their own normal. Know what's normal for each resident.
- Forgetting laxative correlation: Track effectiveness of laxatives by documenting bowel movements relative to when laxatives were given.
Linking to Care Plans
Bowel monitoring should connect to the resident's care plan:
- Document expected bowel pattern (how often, usual type)
- Specify when to give PRN laxatives (e.g., "if no bowel movement for 2 days")
- Note any conditions affecting bowel function (e.g., Parkinson's, opioid use)
- Include dietary interventions (fibre, fluids, prunes)
- Define escalation triggers specific to the individual
Key Takeaway
The Bristol Stool Scale transforms subjective observations into objective, communicable data. Use it consistently, document what you observe, know when to escalate, and always consider bowel health as part of overall wellbeing. For older adults in care homes, good bowel management significantly impacts quality of life.
Visual Bristol Scale in App
Revitaco's bowel tracking includes visual Bristol Scale selection and automatic alerts for constipation risks.
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